there's something you need to remember though
When questing throughout the zones, you'll see stars on your mini map indicating rares/events are nearby. When you kill/complete it, you normally get an item that rewards artefact points to your currently equipped weapon, but not until you actually click it.
Then you get ones called 'earthen shrine' or earth shrine. When you've killed the mobs, your character is struck by a lightning animation and grants the artefact points automatically.
I say remember, cos too often I'd forget and have points going to my ele weapon when I wanted to max my resto one first. I facepalmed many times >.<
Resto is totally viable to level with, I just wanted to play with other specs too before the ptr for 7.0.3 was open